Propeller



1 0 With the abovej the invention consistsin the cons'trl'lction, combination and arrangement of parts \as` will be hereinafter more fullydescribed;

`' of aportion of the blade,

1.1: TENT QFFI'CE;

a or w-AsHrNeroN, nrs'rmc'r or coLmu.

*` niermann,

'Application-dile@ 'August-6,

My invention rela-tes to l aircraft and more particularly to the propeller bladesY An object of'tlieinventionis to provide a Y ,blade with a leadingedge.-

5 means of protectionv for:v thel leading.- edges wear resisting, non-rusting ood-.other obioots iigviow,

Figure 3 is a sectional` 3 3 of Figure 1, and 1r j Figure 4 isl a perspective tecting means.

` Referring more particularly? to the. draw-v of .tho vparo-A ings, the blade proper of an aircraft is'in. `dicated at l-'and is'secured ina hub 2 in lanywell known manner;- A wear resisting metal leadingedge'insert'is` indicated at 3,-that` is' provided withl a tongue 4 for insertion in a groove `5 formed in 'the leading edge 64 ofothe blade 1. In orderto-insure a' posi; ltive fit that will overcome the-tendency of -lips 7 and. 8 formed by the lgroove `5tol bulge, the enlarged portion 9 is undercut, as at 10, to correspond with a bevel in the further' precaution, the' groove 5 is rounded 40 at the rear, as''at 12, to prevent the metal from tearing.. The tongue and groove-joint er. objectl isfl to v provide a propeller j bodiment o 1923. sonar-inademen.

thus formed is secured by co'untersunk rivets 13a s.may be seen in Figure 3 of the drawsert y be vmachinedltolt e form shown in Figure 4, .bent to conform to the contour of. theblade, and afterwards -ground down tofthe finished-shape, or be finished to shape and afterwards inserted and riveted-in place, 5o 'las'desiredg "The-lengt of 4this metal insert has been sliownas extending along the leading edge from v.the tip 'to approximately -the-center of the blade, but 1t is merely illustrative,

as conditions may arise where itwould be- .come 'necessa toward the hu portion. This weari resisttoi extend the insert -well' iugleading edge maybe made of stainless Y -.or non-rusting steel, hardened, tempered 'or- 00 merely untempered'to' h metal, according to the conditions and e use to whichthe propeller'. may be subjected.

Irwin bo understood that' tho above do# '-scription and accompanying drawings. coni- V65 Pre the general and preferred em# i my mvention and .that minor' oportion and arbe, made the" end :only

details in construction,- angement of parts may scope of the appended'elaim without sa'cri- 'I0' -ficing any of the advantagesof-my invention. Having 'thus described my invention what- I'c1aim'1s: Y An aircraft propeller including a hub,vso1id blades carried thereby, the leading edge of' 7 5 leach ofwhich is beveled and groloved, a wear resisting insert undercut to conform to the bevel of the leading-edge ofthe blade and cutaway portion 11 ofthe blindel.A As a provided with a tongue-engaging -in the groove', and means forfsecurlng the inserts, to theblades.

" f STANTON H. -WOOSTEB. 

